CN104328722A - Design scheme of one-way lane-changing T-shaped intersection - Google Patents

Abstract

A design scheme of one-way lane-changing T-shaped intersection. The invention provides a traffic organization design and traffic control method which can improve traffic capacity of an intersection, reduce delay of the intersection and meanwhile enhance safety of pedestrians and non-motor vehicles and belongs to the field of traffic design and traffic control. In the method, through one-way cross lane changing, straight and left-turn conflict points in the intersection are moved outwardly so that left-turn of a main lane and a crossed lane are respectively achieved. Meanwhile, original three-phase control is replaced by two-phase control so that a signal timing period is greatly reduced and signal timing flexibility is improved, which is beneficial to signal and cooperative control at two conflict points and can achieve green-wave traffic so that left-turn demand quantity in the main lane and a branch lane are ensured and road traffic is ensured to be unobstructed.

Description

Single channel changes T-shaped level-crossing design scheme

Technical field

The present invention relates to a kind of traffic organization and the canalization method that improve Traffic Capacity at Intersections of Urban Roads, belong to traffic design and field of traffic control.

Background technology

Along with the development in city, urban road network density is increasing, and people to the demand of traffic also in continuous increase, urban road construction can not meet the demand of people, so seem particularly important to the organization and administration of road network.Before the novel tissue schematic design proposing tee T intersection, we are still to improve the traffic capacity of intersection for principle.In city road network, the crossover node place bottleneck that traffic is current is often the main point causing traffic delay.According to statistics, in city road network, vehicle accounts for 30% of all times in the delay time at stop of crossing.Traffic due to crossing's all directions needs to produce a large amount of conflict such as interflow, shunting, intersection, make intersection become accident multiplely, the traffic accident on urban road has 60% to be occur in crossing.Therefore, how correct design, the traffic at tissue cross mouth place ensure urban traffic safety and unobstructed key.Conventional cross mouth Traffic Organization has two kinds: one selects flat A1 class intersection (traffic signalization, entrance driveway broadening intersection); Another kind intersects at advanced road and inferior grade road, selects flat B1 class intersection (center, main line isolates closed, the branch road only accurate intersection of passing through of turning right).Front a kind of scheme processes by increasing left-hand rotation dedicated phase the conflict of left-hand rotation, although this method has processed the loss that conflict exists signal time, but causes the delay time at stop of intersection to increase, greatly reduce the traffic capacity at crossing.Another kind of scheme is when advanced road and inferior grade road intersect, inferior grade road adopts right-in and right-out, turn left to adopt and realized by the scheme of median U-turn, this scheme forbids that the vehicle on turnpike road turns left on inferior grade road, the accessibility of such road can not meet, and have impact on surrounding resident trip.Therefore, for traditional design scheme when solution intersection traffic tissue, always functionally or the process of the traffic capacity not enough to some extent, by analyzing, innovation, integrate next balanced the addressing this problem of the novel tissue scheme proposing a kind of intersection.

Summary of the invention

This intersection traffic organization scheme is applicable to any grade road and intersects, and the basis that conventional cross mouth canal is drawn is optimized, not only meets transport need but also improve intersection capacity.Concrete design scheme follows following principle: (1) reduces the number of phases that signal controls.Compared with four traditional phase places, this scheme signal controls only need adopt two phase place, decrease cycle time, thus decrease delay, and conflict point greatly reduces, thus reduce traffic accident.Meanwhile, the two place's signal lamps changing setting that intersect can realize " green ripple " control.Signal phase number is fewer, the loss of signal time is fewer, effective green time is more, the traffic capacity is larger, the adjustable elastic of signal period length is larger, more easily accomplishes the cooperation control between intersection, realizes " green ripple " traffic, this scheme is two phase place at Signalized control place, is easy to realize " green ripple " cooperation control.(2) traffic conflict point is reduced.Conflict point is fewer, and traffic safety is higher.With space, two kinds of ways are separated for the traffic conflict point pot life separation that can not reduce process.The conflict point intersected between the craspedodrome wagon flow of changing (space separations) in this scheme, controls (time separation) by signal and is separated, and left turn traffic, right-hand rotation wagon flow change after conflict point cancellation, the conflict point of intersection all greatly reduces.(3) street safety crossed by raising pedestrian and bicycle.Pedestrian crossing scheme is divided into two kinds of plane schemes and stereoscopic scheme: a, is combined with motorway signal lamp, arranges special pedestrian crossing signal lamp and improves safety.B, pedestrian overpass is set in road intersection.Meanwhile, arrange according to canalization and provide pedestrian's street crossing to stop district, increased street chance and crossed street number of times, and improving pedestrian capacity and safety.(4) queue machine can with flow-combining machine meeting.This scheme by intersection change by dealings provide more queue machine can with flow-combining machine meeting, by dealings when there is no Signalized control, when main road red light, entered main road wagon flow queue up by dealings by interflow, it is that Two-phases signal controls that intersection is changed, time signal period is short, for can be more by dealings flow-combining machine, meanwhile, 100m place, intersection can be positioned at owing to intersecting to change, can be longer for queuing track, being supplied to can be more by the queue machine at dealings.Design scheme traffic flow, in scope inner conversion direction, intersection, eliminates after adjustment and the intertexture of keeping straight on, does not need to arrange left-hand rotation dedicated Lanes and special signal phase place, decrease the phase place of intersection, improve the traffic capacity of intersection.Meanwhile, " green ripple " traffic is utilized to reduce stop frequency and traffic delay.This scheme, compared with traditional intersection, reduces phase place, reduces conflict point, reduces delay, improves the operational efficiency of intersection, improves the traffic capacity of intersection.

Accompanying drawing explanation

Fig. 1: single channel changes T-shaped level-crossing design scheme; Fig. 2: single channel changes T-shaped intersection accidents tissue and phase diagram.

Detailed description of the invention

(1) scheme traffic organization is analyzed:scheme as shown in Figure 1, traditional " flat A1 class (traffic signalization; entrance driveway broadening intersection) " improves by it, original crossing intersection is processed to the conflict point in intersection by the method that signal controls, intersect to change by single channel and move outside the craspedodrome in intersection and left-hand rotation conflict point, make main road respectively and realized by dealings; Make three original phase controlling become two phase place to control simultaneously, greatly reduce the cycle of signal timing dial, increase the elasticity of signal timing dial, be conducive to enforcement two conflict place signals and cooperation control, realize green wave traffic, to ensure the fluent of main line and branch road left-hand rotation demand and road.As shown in Figure 2, the program only needs single channel intersection to change to Traffic Organization, changes the vehicle in front that side is entering intersection and need enter road left driving.The vehicle that such left-hand rotation enters road intersection can be avoided and the conflicting of subtend left turning vehicle, thus enters road intersection smoothly.Can be entered main road with queue machine by dealings by flow-combining machine, namely meet by the transport need at dealings, do not affect main road traffic again.The program can realize the craspedodrome of main road, left-hand rotation, right-hand rotation and the left/right rotation by dealings.The program is applicable to the intersection of any traffic volume. (2) geometry designs:geometry designs will meet the requirement of left-hand rotation radius, and it is also very important for namely choosing for the split point turned left, and this can have influence on the design load problem of left-hand rotation radius, can carry out sweetly disposition when design according to the left-hand rotation speed of a motor vehicle.About the sweep offering question changing target phase, preferably design at about 100m, because the length in excessive radius value Hui Shihuan road increases, thus add the scope of this intersection, and the length in too small radius Hui Shihuan road is inadequate, can not completes in time and change, cause traffic jam. (3) Signalized control:signal phase refers to Fig. 2, intersects for three times and changes employing Signalized control, and single crosspoint is that Two-phases signal controls, and three crosspoints adopt signal lamp joint controls, and intersection changes the three place's signal lamps arranged can realize " green ripple " control. (4) pedestrian traffic tissue:pedestrian traffic tissue to enable pedestrian fast and safely pass through road.Arrange crosswalk in place, Neng Shiguo street distance is the shortest is conducive to pedestrains safety.Pedestrian crossing scheme can be divided into plane scheme and stereoscopic scheme two kinds in detail: refer to Fig. 1, cross walk is positioned at intersection and changes Dao Chu, be combined with motorway signal lamp, special pedestrian crossing signal lamp is set and improves safety, because motorway is two phase place, pedestrian needs crossing street twice by road, need arrange pedestrian secondary and cross canalization island, street, the program can increase pedestrian's street crossing chance and number of times, improves pedestrian's street crossing safety simultaneously. (5) traffic safety facilities design:the driver custom caused due to this scheme is different, and (traditional driving habits directly keeps straight on to pass through intersection, and this scheme needs to complete craspedodrome by lane change passes through intersection), so need to carry out detailed design to the traffic safety facilities design of intersection, traffic safety facilities direct drivers is correctly driven, ensures traffic safety.Such as, guiding and Warning Mark is used to pass on direction, track in advance; Speed(-)limit sign is used to ensure the comfortable and safe of driving; Use traffic prohibited sign, help driver and reduce error probability; Adjacent lane be subtend pass through time, guardrail is set and improves subtend traffic safety etc.

Claims (2)

1. improve intersection capacity and reduce an intersection delay, improving Transcation agent and the traffic control method of pedestrian and bicycle safety simultaneously, it is characterized by: within the scope of intersection, single channel intersection is changed; Intersection conflict point is moved forward, and adopts Two-phases signal to control, improve intersection capacity; Green wave traffic is utilized to reduce stop frequency and traffic delay.

2. intersection traffic organization design scheme according to claim 1, it is characterized in that traditional arterial road and branch road to intersect and generally select flat B1 class (isolation of center, main line is closed, branch road is accurate current intersection of turning right only) peaceful A1 class (traffic signalization, entrance driveway broadening intersection) traffic organization form change, the program only needs single channel intersection to change, change the vehicle in front that side is entering intersection and need enter road left driving, the vehicle that such left-hand rotation enters road intersection can be avoided and the conflicting of subtend left turning vehicle, thus enter road intersection smoothly, main road can be entered with queue machine by flow-combining machine by dealings, namely meet by the transport need at dealings, do not affect main road traffic again, the program can realize the craspedodrome of main road, turn left, turn right and by the left/right rotation at dealings, the program is applicable to the intersection of any traffic volume.